-70-(-70)

Let's calculate: -70 -(-70)
ⓘ Subtract a negative number by adding its opposite: the two minus signs become a plus: -(-70) = 70
-70 + 70
ⓘ Start from -70 and move forward 70 on the number line, up to zero: -70 + 70 = 0
▶Result:   0

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